Standard Features

• Monitors and displays three winding and ambient temperatures
• Micro-controller based
• Hinged cabinet
• Programmable on and off set-points
• Automatically displays hottest temperature
• Manually display temperature of all inputs and average of all three inputs
• Status lights for power, fans, alarm, and trip
• Maximum temperature memory for three inputs
• Relays controlled by current highest operating temperature
• Two fan power relays
• Alarm relay for remote monitoring
• Trip relay for remote monitoring
• Local alarm - 90 db
• System test to verify all set-points and ambient temperature
• Instrument and fan power fuses
• Input power 120/240 vac - 50 or 60 Hz

• Fourth and Fifth set-point relay
• Choice of current loops
• Trip signal (6 vdc)
• RS-232
• RS-485
• 100 ohm RTDs (NOT recommended)
• Alarm (95 db or 105 db)

Series 21 Downloads
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1. Model A21 Flier - General Information/Ordering Specifications
2. Model A21 Specifications - Detailed Information on Operation and Hardware
3. Model A21 Features and Options
4. Model A21 Operator Instructions
5. Model A21 Programming Instructions
6. Model A21 Field Installation
7. Model A21 Field Diagnostics
8. Remote Monitoring Software - Hook Your PC to the A21
9. Model C21 Information
10. Changing Setpoints for the Series 21